Dipper-tooth.



APPLICATIUN FILED MAY24. ISIH.

w. G; NICHOLS.

DIFFER TUTH.

Armnrifrs i To all fathom may concern:

UNITED sTATEsrrATENT OFFICE.

`WESLEY G. NICHOLS, OF 'CHICGG HEIGHTS, ILLINOIS, ASSIGNOR T0 AMERICAN MANGANESE STIEEL COMPANU F AUGUSTA, MAINE, A. CRPOBATION 0F MAINE.

Specification of Letters Patent.. ,Patented Aug. 13, 1918.

Continuation of application' Seria1 No..168,074, 'led Kay lil, 1917." This application illed )lay 24,'1918.

^ Seria1No.238,2 59.

Be it known that 1, wenn (ig-mentes, a citizen of the United States, and a resident of ,Chicago Heights, in the county 'of Cook and State of Illinois, have made and i`n.

vented certain' new and useful Improvements in -Dipper-Teeth, of which the Vfollowing is i a specification.

' particularly to i up My invention relates to teeth for dippers for excavating and Similar machines, an

dipperte o or which comprise or shank havinga'wedge-shaped outer-,end

Ior nose,

Vlnewable b `projecting free end'of said ase and the diverging arms of which overle .andare interlocked with 'the inclined faces of-the wedge-shaped end. thereof, so-that when the point becomes worn in .use to such an extent as to be no longer serviceable it-may Vbe reeth which vare made. 'a supporting base tog'etherwitha detachable reiufvd point -sup erred 'yfthe tion upon the base or Sha f With the above and other:ob] ects in view,

my invention consists in-thefimproved dipper tooth and supporting therefor illu'strated in the 'accompanying drawngand moved, and anew point-substituted therefor, thus avoiding 4the necessity of renewing the supporting basewhich forms' the greater portion of the tooth portion thereof becomes worn to suclan extent as to be no longer use, this present case being a continuation of my application forA patent` for dipper teeth filed May 1'2, 1917, ber` No. 168,074..

' The object of my invention is to provide a dipper tooth in which the divergingarms of the removable point overlie the inclined faces of the wedgehaped nose of the shank1 as above stated, and in which dove-tailed lugs carried by and extending longitudinelly of the inner .faces ofthe diverging arms of the point Qfit into recesses of corresponding form provided in the inclined prevented vshaped nose and the Same being substantially arcuate in form, so that their' sides may be ground by the side o f n circular grinding wheel introduced thereunto whereby recessesare provided in which the lugs will at tightly, and

With a minimum .of lost mpeach Itime the point capable of e'ective yof the shank, whereby the lr -72 und 'suohvariations and modifications there() .it is attached;

.broken line V5, 5,

hereinafter described bepbvious to those -skilled in the art to A which my invention relates.

.Inthe drawing accompanying and form-y ing -a partof this' Specification, and wherein the preferred embodiment of :my invention isV illustrated:

Figure-1 is s viewghwing myiini z i r tooth in plan and as Aseen romra-j dippe position within .the dip'per bucket to 4which Fig, 2 is a view. illustratinga section of ,my improved dipper tooth takennpon a lon` itndinally extending planek indicated by ine 2-2 .of Fig.- 1; n'

Fig. 3. is a `fragmentary view principally in section, the section being' taken upon aplane at right-angles to the plane oiFig. .2

the

and indicated by the line 3.-3.of said figure;

Fig. 4 is n plan View corresponding ,with Fig. 1, but showngthe end portion only of the shank or base, the ing been removed;

Fig. 5 s 'a View showing a section taken upon transverse clanes indicated by the Fig. 6 a fragmentary sectional. viewl siniilar to Fig. .2, but showing my invention as applied to n supporting base having Aa slot in its extremity tothereby provide for the support of n detachable-point`having' a web connecting its arms, the .plane of this view being indicated by Fig. 7 is n. view similar showing my invention as applied to a slotted hase of the kind Shownin Fig. 6.'

Referring to the drawing,

numeral 8 designates a supporting base orV shank having a recess 9 adapted to fit over the upper or outer end of the lip ofthe dipper Vof an excavating machine, the same being secured to the -front of the dipper by bolts or rivets extending lolgvhch we is] Ordi-( means of suitable through the holes detachable point havthe ne@ rig...

e) rig. 4; but

he Ireference ion.

A wedge-shaped in forni and constitutes a projecting nose upon and to which the detachable point 12 of the tooth is secured, the said detachable point being bifurcatedl whereby upper and lower diverging arms 13-14 are provided; which arms overlie and extend along the inclined faces of the wedgeslia-ped nose, as shown, the lower of said arms 14 'preferably extending rearwardly beneath the recess l9 far enough to be engaged by bolt-s, rivets or other fastening, means extending through two of the holes 10, as best shown in Fig. 2, whereby additionalI security is provided. for holding the point in place upon the free outer end of the base.

Located. upon and extendin along' the inner surfaces of the incline diverging arms '1B-14, are inwardly projecting lugs .15, the cross-section of which is dove-`tailed in form, as best shown in F ig. 5; These lugs/ fit into recesses 16 correspondin in cross- -section with the cross-section o the lugs,

the said recesses 'bei formed one in the upper and one in the ower of the inclined -faces of the wedge-sha ed nose and ex tending longitudinallyr o the same, as best shown in Fig. 2.` The side walls of these Vrecesses are in the form of a segment of a circle or disk or, as otherwise ex ressed, are arcuate in form; this form o being adopted and used in order that the said -side walls may be finished and ground smooth by the side of a' circular grinding wheel introduced into the recesses, and tipped to an angle corresponding with the angle of the sides thereof and of the lugs 15 which are to fit therein. lIt therefore follows that a tightly fitting joint is se'-V cured betweenthe side walls of the recesses and the side walls of the lugs 15 which contact therewith when the detachable point is in place, thereby reducing 10st motion due cto looseness of the lugs within the recesses to a minimum and securing contact throughout the entire area of the side Walls of the lugs and recesses. It will also be appreci'v ated that the interlocking connection rovided by the dove-tailed lugs ttin into the dove-tailed recesses prevents the iver ing arms 13-14 of thepoint from s reading when the tooth is in use, as eac arm is interlocked with the inclined face of the nose upon which it rests Furthermore,

embodiment of my invention illustrated,

side wall and inoving the point longitudinally, or rather in a direction slightly inclined rela.- tive to the longitudinal axis of the base, in the form of my invention shown, and a new and unused point substituted therefor.

The interlocking connection provided between eacli of the diverging arms 14, 15 'and' the inclined faces of the free end of the supporting base, provides a tooth in which no web extending from one arm of the point to the other is necessary, such Vas is used in many types of teeth for the purpose of preventing the diverging arms from spread\ ing, as the dove-tail form of the lugs and recesses holds the arnis in firm and permanent Contact with the inclinedifaces and prevents the spreading of the arms. My invention, however, is equally applicable to Y supporting Shanks or bases designed to accommodate'a detachable point having a web connecting the diverging arms with one an-V other, and such an adaptation of my invention is illustrated in Figs. 6 and 7. In Fig.

6, the forward end or nose of the supporting .shank 17 is provided with a slot 18 extending from the free outer end of the nose, into the recesses 24 provided in theinclined surfaces thereof, and the-detachable point .19 is provided with a web 20 extending between ithe diverging arms 21, 22 thereof, which web lies within the slot when the point is in place, as shown. The detachable point may I e one having a web extending between the diverging arms thereof and in which lugs interlocking with the recessesare not used, as the slot will accommodate the ,web

lod

whether or not the lugs also are present, or l `and, the web are present, the lu s will dove-tailed in cross-section an -will fitY within the dove-tailed recesses 24, tlie same asin the form of my invention hereinbefore explained; both the lugs and the web in such cases acting toprevent the spreading of the diverging arms of the point and a. much stronger point being thereby secured.

Havingthus described and explained my invention, what I claim as new and desire ,to secure by Letters Patent is:-

1. In adipper tooth, a'supportin having a wedge-shaped nose rovide with oppositely disposed faces inclined with reference to one another, and two recesses havin inclined side .walls whereby a dovetai 'ed cross-section is secured; said recesses llt base

being formed one in. each of said inclined:1

faces and extending longitudinally-thereof,

and the same beingeubstantially arcuate in form so that a circular grinding Wheel may be introduced thereinto to grind the side walls of Said recesses.

2. In a di per tooth, a Supporting base having a wer ge-shaped nose provided with oppositely disposed faces inclined with reference to one another, and two recesses havin inclined side walls whereby a dovetaed crosssection is secured; said recesses being formed one in cach of said inclined faces and extending longitudinally thereof, and the same being vsnibstantially arcuate in form so that a circular grinding wheel'may 4 be introduced thercinto to grlnd the side 15 walls of said recesses, said nose'having also a slot extending from its free end into said reccsscs.`

Signed at Chicago Heights, in the county of Cock and State of lllinuls, this 21st day 30 of May, Af l). l1918.

WESLEY G. Nic-Hons.

Witnesses:

'CHAs LYNCH MARY I. LA ELLE. 

